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The invention provides a transformer substation virtual camera system fused with 3D Gaussian point cloud. The transformer substation virtual camera system fused with 3D Gaussian point cloud comprises a scene building module for building a transformer substation 3DGS model for a transformer substation; the virtual camera setting module obtains virtual camera external parameters set by a user in the 3DGS model of the transformer substation, analyzes virtual camera external parameter information in real time through a space coordinate-pose automatic mapping algorithm, and determines pose information of a virtual camera; the differential rendering module adopts a differential rendering technology to process the 3DGS model of the transformer substation, dynamically analyzes optical parameters of a camera, adjusts the rendering scale and density parameters of Gaussian point cloud according to the optical parameters, and steplessly simulates the optical zoom effect of a real lens to obtain a virtual image; and the imaging output module is used for outputting and presenting the virtual image on the universal hardware. According to the method, the high-precision restoration of the transformer substation is realized by fusing the 3D Gaussian point cloud, the error of the virtual scene of the transformer substation is reduced, the construction efficiency of the virtual scene can be improved, and the cost consumption is reduced.